Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Volvo V40FACTORY OEM SERVICE PROCEDURE
Heater Module (HEA) DTCS
HEATER MODULE (HEA) - DTC INDEX
| DTC | Description |
|---|---|
| HEA-112 | Control module. General fault |
| HEA-113 | Control module. Parameter fault |
| HEA-142 | Outside temperature sensor. Signal too high |
| HEA-143 | Outside temperature sensor. Signal too low |
| HEA-801 | Coolant temperature sensor. Signal too high |
| HEA-802 | Coolant temperature sensor. Signal too low |
| HEA-811 | Flame sensor. Signal too low |
| HEA-813 | Flame sensor. Signal too high |
| HEA-814 | Heater fan. Signal too high |
| HEA-815 | Heater fan. Signal too low |
| HEA-816 | Heater fan. Faulty signal |
| HEA-821 | Water pump. Signal too high |
| HEA-822 | Water pump. Signal too low |
| HEA-825 | Fuel pump (FP). Signal too high |
| HEA-826 | Fuel pump (FP). Signal too low |
| HEA-831 | Overheat protection thermostat. Signal too low |
| HEA-832 | Overheat protection thermostat. Faulty signal |
| HEA-841 | Power supply. Faulty |
| HEA-842 | Power supply. Missing |
| HEA-843 | Control module power supply. Signal too high |
| HEA-851 | Blower fan signal. Signal too high |
| HEA-852 | Blower signal. Signal too low |
| HEA-861 | Glow plugs. Faulty signal |
| HEA-891 | Start attempts. Too many unsuccessful |
| HEA-898 | Factory set diagnostic trouble code (DTC). Faulty code |
| HEA-899 | Factory set diagnostic trouble code (DTC). Faulty code |
| 2-4-1 | Output 2 (Fuel Powered Heater) |
| 2-4-2 | Output 3 (Electrical Heater) |
| 2-4-3 | Timer |
| 2-4-4 | Timer |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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